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首页> 外文期刊>Journal of Computational Physics >An exponential integrator for advection-dominated reactive transport in heterogeneous porous media
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An exponential integrator for advection-dominated reactive transport in heterogeneous porous media

机译:用于非均质多孔介质中对流支配反应输送的指数积分器

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We present an exponential time integrator in conjunction with a finite volume discretisation in space for simulating transport by advection and diffusion including chemical reactions in highly heterogeneous porous media representative of geological reservoirs. These numerical integrators are based on the variation of constants solution and solving the linear system exactly. This is at the expense of computing the exponential of the stiff matrix comprising the finite volume discretisation. Using real Lja points or a Krylov subspace technique compared to standard finite difference-based time integrators. We observe for a variety of example applications that numerical solutions with exponential methods are generally more accurate and require less computational cost. They hence comprise an efficient and accurate method for simulating non-linear advection-dominated transport in geological formations.
机译:我们提出了一个指数时间积分器,结合空间中的有限体积离散化,通过对流和扩散来模拟运输,包括在代表地质储层的高度非均质多孔介质中进行的化学反应。这些数值积分器基于常数解的变化并精确地求解线性系统。这是以计算包含有限体积离散化的刚性矩阵的指数为代价的。与基于标准有限差分的时间积分器相比,使用实Lja点或Krylov子空间技术。我们观察到各种示例应用程序,使用指数方法的数值解通常更准确,并且需要较少的计算成本。因此,它们包括一种用于模拟地质构造中非线性对流主导的输运的有效且准确的方法。

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